package service;

import mapper.UserMapper;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import pojo.User;
import utils.SqlSessionFactoryUtils;

public class UserService {
    //使用工具类获取SqlSessionFactory
    SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();
     //登录方法
    public User login(String username, String password){
        //1. 获取SqlSession
        SqlSession sqlSession = factory.openSession();
        //2. 获取UserMapper
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        //3. 调用方法
        User user = mapper.selectByUsername(username);
        //4. 释放资源
        sqlSession.close();
        //5. 验证密码
        if(user != null){
            if(user.getPassword().equals(password)){
                //验证通过
                return user;
            }else{
                //密码不符
                return null;
            }
        }
        return null;
    }

     //根据用户名查询是否存在该用户
     public boolean checkUsername(String username){
         SqlSession sqlSession = factory.openSession();
         UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
         //1.检查此用户名是否可以被注册
         User user = userMapper.selectByUsername(username);
         if (user!=null){
             //如果此条件成立，代表数据库中已有改名称用户
             return true;
         }
//        2.如果能被注册，则执行注册操作
         sqlSession.close();
         return false;
     }

    //注册用户
    public boolean register(String username, String password) {
        SqlSession sqlSession = factory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        //1.检查此用户名是否可以被注册
        User user = userMapper.selectByUsername(username);
        if (user != null) {
            //如果此条件成立，代表数据库中已有改名称用户
            return false;
        }
            //2.如果能被注册，则执行注册操作
        User newUser = new User(null, username, password);
        int i = userMapper.add(newUser);//添加成功的用户数量
        sqlSession.commit();
        sqlSession.close();
        return i > 0;
    }
}
